Acquisitions (Details)			3 Months Ended	12 Months Ended
	Oct. 16, 2018 USD ($) mi² service_connection	May 30, 2018 USD ($) mi²	Dec. 31, 2019 USD ($) mi²	Dec. 31, 2019 USD ($) mi²
Business Acquisition [Line Items]
Area Of Certificated Service Areas | mi²			354	354
Turner Ranches Water and Sanitation Company [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross | $		$ 2,800,000	$ 2,800,000
Active water connections | $		963
Area Of Certificated Service Areas | mi²		7
Red Rock Utilities [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross | $	$ 5,900,000			$ 5,851,000
Active water connections | service_connection	1,650
Area Of Certificated Service Areas | mi²	9